TWI860810B - Totem-pole pfc circuit and control method thereof - Google Patents

Totem-pole pfc circuit and control method thereof Download PDF

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TWI860810B
TWI860810B TW112129511A TW112129511A TWI860810B TW I860810 B TWI860810 B TW I860810B TW 112129511 A TW112129511 A TW 112129511A TW 112129511 A TW112129511 A TW 112129511A TW I860810 B TWI860810 B TW I860810B
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switch
potential
threshold voltage
power source
bridge arm
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TW112129511A
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TW202414971A (en
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葉永盛
梁志偉
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台達電子工業股份有限公司
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • H02M1/4233—Arrangements for improving power factor of AC input using a bridge converter comprising active switches
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0012—Control circuits using digital or numerical techniques
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H02M1/081—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters wherein the phase of the control voltage is adjustable with reference to the AC source
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0083—Converters characterised by their input or output configuration
    • H02M1/0085—Partially controlled bridges
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/02—Conversion of AC power input into DC power output without possibility of reversal
    • H02M7/04—Conversion of AC power input into DC power output without possibility of reversal by static converters
    • H02M7/12—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/125—Avoiding or suppressing excessive transient voltages or currents
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Rectifiers (AREA)
  • Electronic Switches (AREA)
  • Power Conversion In General (AREA)

Abstract

The present disclosure provides a totem-pole PFC circuit and a control method thereof. The totem-pole PFC circuit includes an AC power source, a first bridge arm, a second bridge arm and a controller. The first bridge arm includes a first switch and a second switch electrically connected in series, and a connection node between the first and second switches is electrically connected to a first terminal of the AC power source. The second bridge arm includes a third switch and a fourth switch electrically connected in series, and a connection node between the third and fourth switches is electrically connected to a second terminal of the AC power source. The controller detects an L-phase voltage. When the potential at the first terminal is higher than the potential at the second terminal, the controller turns off the fourth switch if the L-phase voltage is lower than a first threshold voltage. When the potential at the first terminal is lower than the potential at the second terminal, the controller turns off the third switch if the L-phase voltage is higher than a second threshold voltage.

Description

圖騰柱PFC電路及其控制方法Totem column PFC circuit and control method thereof

本案係關於一種PFC(power factor correction，功率因數校正)電路及其控制方法，尤指一種圖騰柱PFC電路及其控制方法。 This case is about a PFC (power factor correction) circuit and its control method, especially a totem pole PFC circuit and its control method.

在現有針對圖騰柱PFC電路中之慢管的控制方法中，輸入電源分別經由L相及N相電壓偵測線路及電阻分壓後被提供至微處理器的AD引腳，微處理器計算獲得AD讀值後將其與預設值進行比較，進而根據比較結果來控制慢管。 In the existing control method for the slow tube in the totem column PFC circuit, the input power is provided to the AD pin of the microprocessor after passing through the L-phase and N-phase voltage detection circuits and resistor voltage division. The microprocessor calculates the AD reading and compares it with the preset value, and then controls the slow tube according to the comparison result.

然而，由於微處理器需要一定的處理時間來計算AD讀值，故當輸入電壓快速變動換相時，可能因反應不及而使慢管在錯誤相位導通，進而造成短路或元器件毀損等問題。 However, since the microprocessor needs a certain amount of processing time to calculate the AD reading, when the input voltage changes rapidly and the phase is switched, the slow tube may be turned on at the wrong phase due to insufficient response, thus causing problems such as short circuit or component damage.

因此，如何發明一種可改善上述現有技術的圖騰柱PFC電路及其控制方法，實為目前迫切之需求。 Therefore, how to invent a totem column PFC circuit and its control method that can improve the above-mentioned existing technology is an urgent need at present.

本案之目的在於提供一種圖騰柱PFC電路及其控制方法，其僅需偵測輸入電源的L相電壓，並通過將L相電壓與閾值電壓相比較 來控制對應慢管的關斷時機。因此，反應速度較快，即便在輸入電壓快速變動換相時，亦可即時偵測到換相並關斷相應慢管。 The purpose of this case is to provide a totem column PFC circuit and its control method, which only needs to detect the L-phase voltage of the input power supply and control the shutdown timing of the corresponding slow tube by comparing the L-phase voltage with the threshold voltage. Therefore, the response speed is fast, and even when the input voltage changes rapidly and the phase is switched, the phase switching can be detected immediately and the corresponding slow tube can be turned off.

為達上述目的，本案提供一種圖騰柱PFC電路，包含交流電源、第一橋臂、第二橋臂及控制器。第一橋臂包含串聯的第一開關和第二開關，其中第一開關與第二開關之間的連接點電連接於交流電源的第一端。第二橋臂包含串聯的第三開關和第四開關，其中第三開關與第四開關之間的連接點電連接於交流電源的第二端。控制器架構於控制所有開關的運作。控制器偵測交流電源的L相電壓，當第一端的電位高於第二端的電位，控制器在L相電壓低於第一閾值電壓時關斷第四開關；當第一端的電位低於第二端的電位，控制器在L相電壓高於第二閾值電壓時關斷第三開關。 To achieve the above purpose, the present invention provides a totem pole PFC circuit, comprising an AC power source, a first bridge arm, a second bridge arm and a controller. The first bridge arm comprises a first switch and a second switch connected in series, wherein the connection point between the first switch and the second switch is electrically connected to the first end of the AC power source. The second bridge arm comprises a third switch and a fourth switch connected in series, wherein the connection point between the third switch and the fourth switch is electrically connected to the second end of the AC power source. The controller is configured to control the operation of all switches. The controller detects the L-phase voltage of the AC power source. When the potential of the first end is higher than the potential of the second end, the controller turns off the fourth switch when the L-phase voltage is lower than the first threshold voltage; when the potential of the first end is lower than the potential of the second end, the controller turns off the third switch when the L-phase voltage is higher than the second threshold voltage.

為達上述目的，本案另提供一種圖騰柱PFC電路的控制方法，包含：(a)提供圖騰柱PFC電路，其包含交流電源、第一橋臂及第二橋臂，其中第一橋臂包含串聯的第一開關和第二開關，第一開關與第二開關之間的連接點電連接於交流電源的第一端，第二橋臂包含串聯的第三開關和第四開關，第三開關與第四開關之間的連接點電連接於交流電源的第二端；(b)偵測交流電源的L相電壓；(c)當第一端的電位高於第二端的電位，在L相電壓低於第一閾值電壓時關斷第四開關；以及(d)當第一端的電位低於第二端的電位，在L相電壓高於第二閾值電壓時關斷第三開關。 To achieve the above-mentioned purpose, the present invention further provides a control method of a totem pole PFC circuit, comprising: (a) providing a totem pole PFC circuit, which comprises an AC power source, a first bridge arm and a second bridge arm, wherein the first bridge arm comprises a first switch and a second switch connected in series, the connection point between the first switch and the second switch is electrically connected to the first end of the AC power source, and the second bridge arm comprises a third switch and a fourth switch connected in series, the connection point between the third switch and the fourth switch is electrically connected to the second end of the AC power source; (b) detecting the L-phase voltage of the AC power source; (c) when the potential of the first end is higher than the potential of the second end, the fourth switch is turned off when the L-phase voltage is lower than the first threshold voltage; and (d) when the potential of the first end is lower than the potential of the second end, the third switch is turned off when the L-phase voltage is higher than the second threshold voltage.

1:圖騰柱PFC電路 1: Totem column PFC circuit

11:交流電源 11: AC power supply

12:第一橋臂 12: First bridge arm

13:第二橋臂 13: Second bridge arm

14:控制器 14: Controller

15a:正輸出端 15a: Positive output terminal

15b:負輸出端 15b: Negative output terminal

S1:第一開關 S1: First switch

S2:第二開關 S2: Second switch

11a:第一端 11a: First end

S3:第三開關 S3: The third switch

S4:第四開關 S4: The fourth switch

11b:第二端 11b: Second end

L:電感 L: Inductance

16:第三橋臂 16: The third bridge arm

C:電容 C: Capacitor

D1:第一二極體 D1: First diode

D2:第二二極體 D2: Second diode

Vac:輸入電壓 Vac: Input voltage

VL:L相電壓 VL: L phase voltage

V1:第一閾值電壓 V1: First threshold voltage

V2:第二閾值電壓 V2: Second threshold voltage

ST1、ST2、ST3、ST4:步驟 ST1, ST2, ST3, ST4: Steps

第1圖為本案一實施例之圖騰柱PFC電路的電路結構示意圖。 Figure 1 is a schematic diagram of the circuit structure of a totem pole PFC circuit in an embodiment of the present invention.

第2圖例示出第1圖之圖騰柱PFC電路的關鍵電壓波形。 Figure 2 shows the key voltage waveforms of the totem pole PFC circuit in Figure 1.

第3圖為本案一實施例之圖騰柱PFC電路的控制方法的流程示意圖。 Figure 3 is a schematic diagram of the process flow of the control method of the totem column PFC circuit of an embodiment of the present invention.

體現本案特徵與優點的一些典型實施例將在後段的說明中詳細敘述。應理解的是本案能夠在不同的態樣上具有各種的變化，其皆不脫離本案之範圍，且其中的說明及圖示在本質上係當作說明之用，而非用以限制本案。 Some typical embodiments that embody the features and advantages of this case will be described in detail in the following description. It should be understood that this case can have various variations in different forms, all of which do not deviate from the scope of this case, and the descriptions and illustrations therein are essentially for illustrative purposes rather than for limiting this case.

第1圖為本案一實施例之圖騰柱PFC(power factor correction，功率因數校正)電路的電路結構示意圖。如第1圖所示，圖騰柱PFC電路1包含交流電源11、第一橋臂12、第二橋臂13及控制器14，並具有正輸出端15a及負輸出端15b。第一橋臂12包含相互串聯的第一開關S1和第二開關S2，其中第一開關S1與第二開關S2之間的連接點電連接於交流電源11的第一端11a，且第一開關S1及第二開關S2分別耦接於正輸出端15a及負輸出端15b。第一開關S1及第二開關S2係作為圖騰柱PFC電路1中的快管。第二橋臂13包含相互串聯連接的第三開關S3和第四開關S4，其中第三開關S3與第四開關S4之間的連接點電連接於交流電源11的第二端11b，且第三開關S3及第四開關S4分別耦接於正輸出端15a及負輸出端15b。第三開關S3及第四開關S4係作為圖騰柱PFC電路1中的慢管。控制器14架構於控制所有開關的運作。需注意的是，第一開關S1、第二開關S2、第三開關S3及第四開關S4可為金屬氧化物半導體場效電晶體或任意適當之電晶體，而不受限於第1圖中所示開關類型。 FIG. 1 is a schematic diagram of the circuit structure of a totem pole PFC (power factor correction) circuit of an embodiment of the present invention. As shown in FIG. 1, the totem pole PFC circuit 1 includes an AC power source 11, a first bridge arm 12, a second bridge arm 13 and a controller 14, and has a positive output terminal 15a and a negative output terminal 15b. The first bridge arm 12 includes a first switch S1 and a second switch S2 connected in series with each other, wherein the connection point between the first switch S1 and the second switch S2 is electrically connected to the first terminal 11a of the AC power source 11, and the first switch S1 and the second switch S2 are coupled to the positive output terminal 15a and the negative output terminal 15b, respectively. The first switch S1 and the second switch S2 serve as fast tubes in the totem pole PFC circuit 1. The second bridge arm 13 includes a third switch S3 and a fourth switch S4 connected in series, wherein the connection point between the third switch S3 and the fourth switch S4 is electrically connected to the second end 11b of the AC power source 11, and the third switch S3 and the fourth switch S4 are coupled to the positive output end 15a and the negative output end 15b respectively. The third switch S3 and the fourth switch S4 are used as slow tubes in the totem column PFC circuit 1. The controller 14 is configured to control the operation of all switches. It should be noted that the first switch S1, the second switch S2, the third switch S3 and the fourth switch S4 can be metal oxide semiconductor field effect transistors or any suitable transistors, and are not limited to the switch types shown in Figure 1.

於一些實施例中，圖騰柱PFC電路1還包含電感L、第三橋臂16及電容C。電感L的兩端分別電連接於交流電源11的第一端11a和第一開關S1與第二開關S2之間的連接點，換言之，第一開關S1與第二開關S2之間的連接點經由電感L電連接於交流電源11的第一端11a。第三橋臂16包含相互串聯連接的第一二極體D1和第二二極體D2，其中第一二極體D1的陰極和陽極分別耦接於正輸出端15a和第二二極體D2的陰極，第二二極體D2的陽極耦接於負輸出端15b，且第一二極體D1與第二二極體D2之間的連接點電連接於交流電源11的第一端11a。電容C並聯連接於第一橋臂12、第二橋臂13及第三橋臂16，且電容C的兩端分別耦接於正輸出端15a及負輸出端15b。 In some embodiments, the totem pole PFC circuit 1 further includes an inductor L, a third bridge arm 16, and a capacitor C. Two ends of the inductor L are electrically connected to the first end 11a of the AC power source 11 and the connection point between the first switch S1 and the second switch S2, respectively. In other words, the connection point between the first switch S1 and the second switch S2 is electrically connected to the first end 11a of the AC power source 11 through the inductor L. The third bridge arm 16 includes a first diode D1 and a second diode D2 connected in series, wherein the cathode and anode of the first diode D1 are coupled to the positive output terminal 15a and the cathode of the second diode D2 respectively, the anode of the second diode D2 is coupled to the negative output terminal 15b, and the connection point between the first diode D1 and the second diode D2 is electrically connected to the first terminal 11a of the AC power source 11. The capacitor C is connected in parallel to the first bridge arm 12, the second bridge arm 13 and the third bridge arm 16, and the two ends of the capacitor C are coupled to the positive output terminal 15a and the negative output terminal 15b respectively.

由於本案著重於對慢管的控制，故對快管的控制方式可參考現有作法，於本案中不多加贅述。 Since this case focuses on the control of slow tubes, the control method of fast tubes can refer to existing practices and will not be elaborated in this case.

請參閱第1圖及第2圖，其中第2圖例示出第1圖之圖騰柱PFC電路的關鍵電壓波形。於第2圖中，Vac代表交流電源11所提供的輸入電壓，VL為交流電源11的L相電壓(line-phase voltage)。如第1圖及第2圖所示，控制器14偵測交流電源11的L相電壓VL。當交流電源11的第一端11a的電位高於交流電源11的第二端11b的電位(即在輸入電壓Vac的正半週)，控制器14在L相電壓VL低於第一閾值電壓V1時關斷第四開關S4，並在L相電壓VL高於第一閾值電壓V1時導通第四開關S4。反之，當交流電源11的第一端11a的電位低於交流電源11的第二端11b的電位(即在輸入電壓Vac的負半週)，控制器14在L相電壓VL高 於第二閾值電壓V2時關斷第三開關S3，並在L相電壓VL低於第二閾值電壓V2時導通第三開關S3。 Please refer to FIG. 1 and FIG. 2, wherein FIG. 2 illustrates the key voltage waveform of the totem pole PFC circuit of FIG. 1. In FIG. 2, Vac represents the input voltage provided by the AC power source 11, and VL is the L-phase voltage (line-phase voltage) of the AC power source 11. As shown in FIG. 1 and FIG. 2, the controller 14 detects the L-phase voltage VL of the AC power source 11. When the potential of the first terminal 11a of the AC power source 11 is higher than the potential of the second terminal 11b of the AC power source 11 (i.e., in the positive half cycle of the input voltage Vac), the controller 14 turns off the fourth switch S4 when the L-phase voltage VL is lower than the first threshold voltage V1, and turns on the fourth switch S4 when the L-phase voltage VL is higher than the first threshold voltage V1. On the contrary, when the potential of the first terminal 11a of the AC power source 11 is lower than the potential of the second terminal 11b of the AC power source 11 (i.e., in the negative half cycle of the input voltage Vac), the controller 14 turns off the third switch S3 when the L-phase voltage VL is higher than the second threshold voltage V2, and turns on the third switch S3 when the L-phase voltage VL is lower than the second threshold voltage V2.

藉此，本案僅需偵測交流電源11的L相電壓VL，並通過將L相電壓VL與閾值電壓(V1、V2)相比較來控制對應慢管(S3、S4)的關斷時機。因此，反應速度較快，即便在輸入電壓Vac快速變動換相時，亦可即時偵測到換相並關斷相應慢管(S3、S4)。 Thus, the present invention only needs to detect the L-phase voltage VL of the AC power source 11, and control the shutdown timing of the corresponding slow tube (S3, S4) by comparing the L-phase voltage VL with the threshold voltage (V1, V2). Therefore, the response speed is faster, and even when the input voltage Vac changes rapidly and changes phase, the phase change can be detected immediately and the corresponding slow tube (S3, S4) can be turned off.

此外，第一閾值電壓V1及第二閾值電壓V2係接近於輸入電壓Vac之過零點處的L相電壓VL，且第一閾值電壓V1及第二閾值電壓V2的大小取決於控制器14的偵測精度、圖騰柱PFC電路1的輸出功率和圖騰柱PFC電路1的期望工作效率。具體而言，以第一閾值電壓V1為例，第一閾值電壓V1不可過低至控制器14無法進行偵測，且第一閾值電壓V1亦不可過高而導致圖騰柱PFC電路1無法達成其預期之輸出功率和工作效率。 In addition, the first threshold voltage V1 and the second threshold voltage V2 are close to the L-phase voltage VL at the zero-crossing point of the input voltage Vac, and the magnitude of the first threshold voltage V1 and the second threshold voltage V2 depends on the detection accuracy of the controller 14, the output power of the totem pole PFC circuit 1, and the expected working efficiency of the totem pole PFC circuit 1. Specifically, taking the first threshold voltage V1 as an example, the first threshold voltage V1 cannot be too low so that the controller 14 cannot detect it, and the first threshold voltage V1 cannot be too high so that the totem pole PFC circuit 1 cannot achieve its expected output power and working efficiency.

另外，控制器14可例如包含比較器或微處理器，以利用比較器或微處理器將L相電壓VL與第一閾值電壓V1和第二閾值電壓V2相比較，但亦不以此為限。 In addition, the controller 14 may include a comparator or a microprocessor, for example, to compare the L-phase voltage VL with the first threshold voltage V1 and the second threshold voltage V2 using the comparator or the microprocessor, but is not limited thereto.

第3圖為本案一實施例之圖騰柱PFC電路的控制方法的流程示意圖，此控制方法適用於本案之圖騰柱PFC電路1。如第3圖所示，控制方法包含如下步驟。 FIG. 3 is a flow chart of a control method of a totem pole PFC circuit in an embodiment of the present invention. This control method is applicable to the totem pole PFC circuit 1 of the present invention. As shown in FIG. 3, the control method includes the following steps.

於步驟ST1中，提供圖騰柱PFC電路1。 In step ST1, a totem pole PFC circuit 1 is provided.

於步驟ST2中，偵測交流電源11的L相電壓VL。 In step ST2, the L-phase voltage VL of the AC power source 11 is detected.

於步驟ST3中，當交流電源11的第一端11a的電位高於交流電源11的第二端11b的電位，在L相電壓VL低於第一閾值電壓V1時關斷第四開關S4。 In step ST3, when the potential of the first terminal 11a of the AC power source 11 is higher than the potential of the second terminal 11b of the AC power source 11, the fourth switch S4 is turned off when the L-phase voltage VL is lower than the first threshold voltage V1.

於步驟ST4中，當交流電源11的第一端11a的電位低於交流電源11的第二端11b的電位，在L相電壓VL高於第二閾值電壓V2時關斷第三開關S3。 In step ST4, when the potential of the first terminal 11a of the AC power source 11 is lower than the potential of the second terminal 11b of the AC power source 11, the third switch S3 is turned off when the L-phase voltage VL is higher than the second threshold voltage V2.

於一些實施例中，控制方法還包含：當交流電源11的第一端11a的電位高於交流電源11的第二端11b的電位，在L相電壓VL高於第一閾值電壓V1時導通第四開關S4；以及當交流電源11的第一端11a的電位低於交流電源11的第二端11b的電位，在L相電壓VL低於第二閾值電壓V2時導通第三開關S3。 In some embodiments, the control method further includes: when the potential of the first end 11a of the AC power source 11 is higher than the potential of the second end 11b of the AC power source 11, the fourth switch S4 is turned on when the L-phase voltage VL is higher than the first threshold voltage V1; and when the potential of the first end 11a of the AC power source 11 is lower than the potential of the second end 11b of the AC power source 11, the third switch S3 is turned on when the L-phase voltage VL is lower than the second threshold voltage V2.

於一些實施例中，控制方法還包含：利用比較器或微處理器將L相電壓VL與第一閾值電壓V1和第二閾值電壓V2相比較。 In some embodiments, the control method further includes: using a comparator or a microprocessor to compare the L-phase voltage VL with the first threshold voltage V1 and the second threshold voltage V2.

綜上所述，本案提供一種圖騰柱PFC電路及其控制方法，其僅需偵測輸入電源的L相電壓，並通過將L相電壓與閾值電壓相比較來控制對應慢管的關斷時機。因此，反應速度較快，即便在輸入電壓快速變動換相時，亦可即時偵測到換相並關斷相應慢管。 In summary, this case provides a totem pole PFC circuit and a control method thereof, which only needs to detect the L-phase voltage of the input power supply and control the shutdown timing of the corresponding slow tube by comparing the L-phase voltage with the threshold voltage. Therefore, the response speed is fast, and even when the input voltage changes rapidly and the phase is switched, the phase switching can be detected immediately and the corresponding slow tube can be turned off.

須注意，上述僅是為說明本案而提出之較佳實施例，本案不限於所述之實施例，本案之範圍由如附專利申請範圍決定。且本案得由熟習此技術之人士任施匠思而為諸般修飾，然皆不脫如附專利申請範圍所欲保護者。 It should be noted that the above is only a preferred embodiment proposed for the purpose of illustrating this case. This case is not limited to the embodiment described above. The scope of this case is determined by the scope of the attached patent application. Moreover, this case can be modified in various ways by people familiar with this technology, but it does not deviate from the scope of the attached patent application to be protected.

1:圖騰柱PFC電路 1: Totem column PFC circuit

11:交流電源 11: AC power supply

12:第一橋臂 12: First bridge arm

13:第二橋臂 13: Second bridge arm

14:控制器 14: Controller

15a:正輸出端 15a: Positive output terminal

15b:負輸出端 15b: Negative output terminal

S1:第一開關 S1: First switch

S2:第二開關 S2: Second switch

11a:第一端 11a: First end

S3:第三開關 S3: The third switch

S4:第四開關 S4: The fourth switch

11b:第二端 11b: Second end

L:電感 L: Inductance

16:第三橋臂 16: The third bridge arm

C:電容 C: Capacitor

D1:第一二極體 D1: First diode

D2:第二二極體 D2: Second diode

Claims (10)

一種圖騰柱PFC(power factor correction，功率因數校正)電路，包含：一交流電源；一第一橋臂，包含串聯的一第一開關和一第二開關，其中該第一開關與該第二開關之間的連接點電連接於該交流電源的第一端；一第二橋臂，包含串聯的一第三開關和一第四開關，其中該第三開關與該第四開關之間的連接點電連接於該交流電源的第二端；以及一控制器，架構於控制該些開關的運作，其中，該控制器偵測該交流電源的L相電壓，當該第一端的電位高於該第二端的電位，該控制器在該L相電壓低於第一閾值電壓時關斷該第四開關，當該第一端的該電位低於該第二端的該電位，該控制器在該L相電壓高於第二閾值電壓時關斷該第三開關。 A totem column PFC (power factor A power factor correction circuit comprises: an AC power source; a first bridge arm comprising a first switch and a second switch connected in series, wherein the connection point between the first switch and the second switch is electrically connected to the first end of the AC power source; a second bridge arm comprising a third switch and a fourth switch connected in series, wherein the connection point between the third switch and the fourth switch is electrically connected to the second end of the AC power source; and a controller configured to control the operation of the switches, wherein the controller detects the L-phase voltage of the AC power source, and when the potential of the first end is higher than the potential of the second end, the controller turns off the fourth switch when the L-phase voltage is lower than the first threshold voltage, and when the potential of the first end is lower than the potential of the second end, the controller turns off the third switch when the L-phase voltage is higher than the second threshold voltage. 如請求項1所述之圖騰柱PFC電路，其中當該第一端的該電位高於該第二端的該電位，該控制器在該L相電壓高於該第一閾值電壓時導通該第四開關，當該第一端的該電位低於該第二端的該電位，該控制器在該L相電壓低於該第二閾值電壓時導通該第三開關。 The totem pole PFC circuit as described in claim 1, wherein when the potential of the first end is higher than the potential of the second end, the controller turns on the fourth switch when the L phase voltage is higher than the first threshold voltage, and when the potential of the first end is lower than the potential of the second end, the controller turns on the third switch when the L phase voltage is lower than the second threshold voltage. 如請求項1所述之圖騰柱PFC電路，其中該第一閾值電壓及該第二閾值電壓取決於該控制器的偵測精度、該圖騰柱PFC電路的輸出功率和該圖騰柱PFC電路的期望工作效率。 A totem pole PFC circuit as described in claim 1, wherein the first threshold voltage and the second threshold voltage depend on the detection accuracy of the controller, the output power of the totem pole PFC circuit and the expected working efficiency of the totem pole PFC circuit. 如請求項1所述之圖騰柱PFC電路，其中該控制器包含架構於將該L相電壓與該第一閾值電壓和該第二閾值電壓相比較的一比較器或一微處理器。 A totem pole PFC circuit as described in claim 1, wherein the controller includes a comparator or a microprocessor configured to compare the L-phase voltage with the first threshold voltage and the second threshold voltage. 如請求項1所述之圖騰柱PFC電路，其中該第一開關、該第二開關、該第三開關及該第四開關為金屬氧化物半導體場效電晶體。 The totem pole PFC circuit as described in claim 1, wherein the first switch, the second switch, the third switch and the fourth switch are metal oxide semiconductor field effect transistors. 如請求項1所述之圖騰柱PFC電路，還包含一電感、一第三橋臂及一電容，其中該第一開關與該第二開關之間的該連接點經由該電感電連接於該交流電源的該第一端，該第三橋臂包含串聯連接的第一二極體和第二二極體，該第一二極體與該第二二極體之間的連接點電連接於該交流電源的該第一端，該電容並聯連接於該第一橋臂、該第二橋臂及該第三橋臂。 The totem pole PFC circuit as described in claim 1 further comprises an inductor, a third bridge arm and a capacitor, wherein the connection point between the first switch and the second switch is electrically connected to the first end of the AC power source via the inductor, the third bridge arm comprises a first diode and a second diode connected in series, the connection point between the first diode and the second diode is electrically connected to the first end of the AC power source, and the capacitor is connected in parallel to the first bridge arm, the second bridge arm and the third bridge arm. 一種圖騰柱PFC電路的控制方法，包含：(a)提供一圖騰柱PFC電路，其包含一交流電源、一第一橋臂及一第二橋臂，其中該第一橋臂包含串聯的一第一開關和一第二開關，該第一開關與該第二開關之間的連接點電連接於該交流電源的第一端，該第二橋臂包含串聯的一第三開關和一第四開關，該第三開關與該第四開關之間的連接點電連接於該交流電源的第二端；(b)偵測該交流電源的L相電壓；(c)當該第一端的電位高於該第二端的電位，在該L相電壓低於第一閾值電壓時關斷該第四開關；以及(d)當該第一端的該電位低於該第二端的該電位，在該L相電壓高於第二閾值電壓時關斷該第三開關。 A control method of a totem pole PFC circuit comprises: (a) providing a totem pole PFC circuit, which comprises an AC power source, a first bridge arm and a second bridge arm, wherein the first bridge arm comprises a first switch and a second switch connected in series, and a connection point between the first switch and the second switch is electrically connected to a first end of the AC power source; and the second bridge arm comprises a third switch and a fourth switch connected in series, and the third switch (a) connecting the first end of the AC power source to the fourth switch; (b) detecting the L-phase voltage of the AC power source; (c) when the potential of the first end is higher than the potential of the second end, turning off the fourth switch when the L-phase voltage is lower than a first threshold voltage; and (d) when the potential of the first end is lower than the potential of the second end, turning off the third switch when the L-phase voltage is higher than a second threshold voltage. 如請求項7所述之控制方法，還包含： (e)當該第一端的該電位高於該第二端的該電位，在該L相電壓高於該第一閾值電壓時導通該第四開關；以及(f)當該第一端的該電位低於該第二端的該電位，在該L相電壓低於該第二閾值電壓時導通該第三開關。 The control method as described in claim 7 further comprises: (e) when the potential of the first end is higher than the potential of the second end, the fourth switch is turned on when the L-phase voltage is higher than the first threshold voltage; and (f) when the potential of the first end is lower than the potential of the second end, the third switch is turned on when the L-phase voltage is lower than the second threshold voltage. 如請求項7所述之控制方法，其中該第一閾值電壓及該第二閾值電壓取決於偵測該交流電源的該L相電壓的偵測精度、該圖騰柱PFC電路的輸出功率和該圖騰柱PFC電路的期望工作效率。 A control method as described in claim 7, wherein the first threshold voltage and the second threshold voltage depend on the detection accuracy of the L-phase voltage of the AC power source, the output power of the totem pole PFC circuit, and the expected working efficiency of the totem pole PFC circuit. 如請求項7所述之控制方法，還包含：利用一比較器或一微處理器將該L相電壓與該第一閾值電壓和該第二閾值電壓相比較。 The control method as described in claim 7 further includes: using a comparator or a microprocessor to compare the L-phase voltage with the first threshold voltage and the second threshold voltage.
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WO2022165485A1 (en) * 2021-01-29 2022-08-04 Inventchip Technology Co., Ltd. Totem-pole bridgeless power factor correction device and power supply
CN214755496U (en) * 2021-05-10 2021-11-16 康舒科技股份有限公司 Current Protection Control Circuit of Totem Pole Boost Converter

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US12463530B2 (en) 2025-11-04

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